View full sizeOregon Ducks running back Byron Marshall (9) during the 2013 spring game at Autzen Stadium.Thomas Boyd/The Oregonian

Ninth in a 10-part series previewing a key player at each position
(and a coach) who could have an increased impact on the Oregon Ducks'
fortunes in 2013.

No. 2: Sophomore running back Byron Marshall.

The loss of All-American Kenjon Barner to the NFL left 278 carries up for grabs and Marshall appears set to collect a large chunk of them.

As a true freshman last season he

rushed for 447 yards and four touchdowns on 87 carries (5.1 yards per carry average) while displaying a strong knack for running both inside and outside.

He has enough speed to be a home run threat while also carrying enough bulk (201 pounds) to pound the ball inside.

View full sizeAloha running back Thomas Tyner (4) leaves a trail of Glencoe defenders as he scores on a 95 yard run in 2012. Doug Beghtel/The Oregonian

Reasons for importance: Junior De'Anthony Thomas returns and will be the lead back. He should surpass 1,000 yards rushing. But at 176 pounds, he lacks the size to carry a full-time load. Five-star recruit Thomas Tyner (Aloha) has the potential to make an instant impact given his incredible speed but could require an adjustment period, such as Marshall (four-star recruit in 2011) needed last season.

Quarterback Marcus Mariota could pass more often this season but the heart of the offense remains the zone read and the running game and right now, Marshall has the best combination of size, speed and experience to be a key focal point of the running game. According to coaches, Marshall showed tremendous improvement during the spring. Backup plan:Tyner could easily make an instant impact. Junior Ayele Forde was awarded a scholarship last spring and will continue to provide solid depth. Freshman Kani Benoit could be the best power back on the roster.